Pure and Applied Geophysics

, Volume 176, Issue 8, pp 3665–3680 | Cite as

Intraseasonal Convection and Air–Sea Fluxes Over the Indian Monsoon Region Revealed from the Bimodal ISO Index

  • Gopinadh Konda
  • Naresh Krishna VissaEmail author


The present study aims to elucidate the intraseasonal oscillations (ISO) of atmospheric convection and air–sea fluxes over the Indian region during summer monsoon season. To accomplish this, the study employs the extended empirical orthogonal function-based bimodal ISO index developed by Kikuchi et al. [Clim Dyn 38(9–10):1989–2000, 2012]. The propagation of deep convective anomalies and air–sea fluxes are explored during the different phases (P1–P8) of the bimodal index. This is achieved by examining the Tropical Rainfall Measuring Mission satellite rainfall, outgoing long-wave radiation (OLR), sea surface temperatures (SST), downward shortwave radiation (DSR) and reanalysis products of 850-hPa winds, potential vorticity and latent heat fluxes (LHFs). Composite analysis of the anomalies depicts the strong (weak) northward (eastward) propagation of convective anomalies over the Indian region (equatorial Indian Ocean). Over the Indian region, active (suppressed or weak) convection is evident during the phases of P4 and P5 (P1, P2 and P7, P8). Enhanced deep convection is lead by a phase of 850-hPa westerly winds and negative SST anomalies. Signatures of ISO during different phases are examined from Research Moored Array for African-Asian-Australian Monson Analysis and Prediction (RAMA) buoy observations over the Bay of Bengal. Rainfall, SST and LHF anomalies from RAMA buoy measurements are in concurrence with the spatial composites of bimodal ISO phases. Plausible drivers for the variability of intraseasonal convection and air–sea fluxes were reviewed using published observational and modelling studies. Findings from the present study advocate the applicability of Kikuchi bimodal index [Clim Dyn 38(9–10):1989–2000, 2012] over the Indian region and have practical application for the validation of ocean-atmospheric coupled models.


Indian summer monsoon intraseasonal bimodal convection and air–sea fluxes 



The authors would like to acknowledge the Department of Science and Technology, Government of India [Science and Engineering Research Board (grant ref: ECR/2016/001896)]. NKV would like to thank late Prof. M. Bonell (University of Dundee, UK) for sharing his wonderful knowledge and experience on this topic. The authors would like to thank the editors Dr. M Ravichandran and Dr. VSN Murty for their initial comments. The authors are grateful to the anonymous reviewers for their meticulous comments and valuable suggestions.


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© Springer Nature Switzerland AG 2019

Authors and Affiliations

  1. 1.Department of Earth and Atmospheric SciencesNational Institute of Technology RourkelaRourkelaIndia

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